qedit/samplegrabber: Don't expose IMediaPosition from the filter.

dlls/qedit/samplegrabber.c

@@ -296,8 +296,6 @@ static HRESULT WINAPI SampleGrabber_QueryInterface(IUnknown *iface, REFIID riid,
         *ppv = &This->filter.IBaseFilter_iface;
     else if (IsEqualIID(riid, &IID_ISampleGrabber))
         *ppv = &This->ISampleGrabber_iface;
-    else if (IsEqualIID(riid, &IID_IMediaPosition))
-        return IUnknown_QueryInterface(This->seekthru_unk, riid, ppv);
     else if (IsEqualIID(riid, &IID_IMediaSeeking))
         return IUnknown_QueryInterface(This->seekthru_unk, riid, ppv);
     else
@@ -832,7 +830,7 @@ SampleGrabber_IPin_QueryInterface(IPin *iface, REFIID riid, void **ppv)
     else if (IsEqualIID(riid, &IID_IMediaSeeking))
         return IUnknown_QueryInterface(&This->sg->IUnknown_inner, riid, ppv);
     else if (IsEqualIID(riid, &IID_IMediaPosition))
-        return IUnknown_QueryInterface(&This->sg->IUnknown_inner, riid, ppv);
+        return IUnknown_QueryInterface(This->sg->seekthru_unk, riid, ppv);
     else {
         WARN("(%p, %s,%p): not found\n", This, debugstr_guid(riid), ppv);
         return E_NOINTERFACE;

dlls/qedit/tests/samplegrabber.c

@@ -62,7 +62,7 @@ static void test_interfaces(void)
     check_interface(filter, &IID_IBasicAudio, FALSE);
     check_interface(filter, &IID_IBasicVideo, FALSE);
     check_interface(filter, &IID_IKsPropertySet, FALSE);
-    todo_wine check_interface(filter, &IID_IMediaPosition, FALSE);
+    check_interface(filter, &IID_IMediaPosition, FALSE);
     todo_wine check_interface(filter, &IID_IMediaSeeking, FALSE);
     check_interface(filter, &IID_IMemInputPin, FALSE);
     check_interface(filter, &IID_IPersistPropertyBag, FALSE);